<template>
    <div>
        <h1>当前的求和为:{{ sum }}</h1>
        <select v-model="n">
            <option :value="1">1</option>
            <option :value="2">2</option>
            <option :value="3">3</option>
        </select>
        <button @click="increment">+</button>
        <button @click="decrement">-</button>
        <button @click="incrementOdd">当前求和为奇数再加</button>
        <button @click="incrementWait">等一等再加</button>
    </div>
</template>

<script>
export default {
    name: "CountNumber",
    props: ['title'],
    data() {
        return {
            n: 1,
            sum: 0
        }
    },
    methods: {
        increment() {
            this.sum += this.n
        },
        decrement() {
            this.sum -= this.n
        },
        incrementOdd() {
            if (this.sum % 2 === 1) {
                this.sum += this.n
            }
        },
        incrementWait() {
            setTimeout(() => {
                this.sum += this.n
            }, 500)
        },
    }
}
</script>

<style scoped>
button {
    margin-left: 5px;
}
</style>